After advancing to
Earthly Yuan Stage, the most vital step was to absorb Yin Energy, that existed between Heaven and Earth, into one’s body. After which, the Yin Energy will merge with the Yuan Power that lies in one’s body, greatly enhancing the attacking potential of one’s Yuan Power. Subsequently, when one advances to Heavenly Yuan Stage, one must absorb the Yang Energy, that exists between Heaven and Earth, into one’s body. Eventually, when the Yin and Yang Energy within one’s body synergizes, a Yuan Dan will be formed. This was eventually called Stealing Yin and Yang. When the two of them interacted with each, it was akin to water mixing with fire. They are completely incompatible. 
Thus for the Earth Yuan and Heavenly Yuan stages, Yin and Yang Energy could be considered the most important components. However, within Heaven and Earth, Yin and Yang Energy can be classified into different grades and categories, with each possessing their own advantages and disadvantages. Most people would however, choose to absorb Yin Yang energy directly from Heaven and Earth because it was the most convenient method. After all, special Yin Yang Energy is not so easily chanced upon. Naturally though, this method would result in them being slightly weaker.
Of course, some wealthy people would rather choose to absorb special Yin Yang Energy. This way, they will end up distinctly stronger than a practitioner on the same Stage as them.
Besides, the higher the quality of Yin Yang Energy absorbed during the Earthly and Heavenly Yuan stages, the stronger the Yuan Dan formed will be!
Thus, some wealthier people will expend vast resources in order to find various kinds of special Yin Yang Energy to allow their Yuan Dan formed to be of a higher quality.
Cultivation Yuan Power
Tempered Body 1st Layer, Tempered Body 2nd Layer, Tempered Body 3rd Layer, Tempered Body 4th Layer, Tempered Body 5th Layer, Tempered Body 6th Layer, Tempered Body 7th Layer, Tempered Body 8th Layer, Tempered Body 9th Layer, Earthly Yuan Early Stage, Earthly Yuan Middle Stage, Earthly Yuan Late Stage, Heavenly Yuan Early Stage, Heavenly Yuan Middle Stage, Heavenly Yuan Late Stage, Initial Yuan Dan Stage, Advanced Yuan Dan Stage, Perfect Yuan Dan Stage, Initial Form Creation Stage, Advanced Form Creation Stage, Initial Qi Creation Stage, Advanced Qi Creation Stage, Halfway to Manifestation Stage, Initial Manifestation Stage, Quasi-Advanced Manifestation Stage, Advanced Manifestation Stage, Peak Manifestation Stage, Half-Step Nirvana Stage, Nirvana Stage, One Yuan Nirvana Stage, Two Yuan Nirvana Stage, Three Yuan Nirvana Stage, Four Yuan Nirvana Stage, Five Yuan Nirvana Stage, Six Yuan Nirvana Stage, Seven Yuan Nirvana Stage, Eight Yuan Nirvana Stage, Nine Yuan Nirvana Stage, Half-Step Profound Life Stage, Initial Profound Life Stage, Advanced Profound Life Stage, Perfect Profound Life Stage, Initial Profound Death Stage, Advanced Profound Death Stage, Perfect Profound Death Stage
Cultivation Symbol Master
1st Seal Symbol Master, 2nd Seal Symbol Master, 3rd Seal Symbol Master, 4th Seal Symbol Master, 5th Seal Symbol Master
Yin Pearl, Golden Jade Branch, Red Ginseng, Scarlet Sun Grass, Vermillion Blood Clotting Fruit, Light Green Herb, Red Liquid or Ling Liquid, Crystal Vermillion Fruit, Yellow Mud Fruit, Blaze Fruit, Yang Yuan Pill, Flaming Crimson Reishi, Green Wood Rhizome, Fire Ancestral Phantom Flower, Pure Yuan Pill, Void Spirit Grass, Yin Yang Pearl, Purple Cloud Fruit, Starry Yang Fruit, Nirvana Pill, Samsara Pill, Crossing Disaster Pill, Balance Spirit Fruit, Earth Core Spiritual Brewing Saliva, Soul Returning Pill, Mysterious Life Spirit Fruit, Xuan Yuan Pill, Core Spiritual Birth Serum, Great Desolation bead, Sea King Spirit Grass, Deathly Silent Pill
Penetrating Fist, Falling Rock Fist, Eight Desolations Palm, Spirit Finger Sword, Rock Splitting Leg, Landslide Punch, Whirlwind Kick, Wandering Palm, Velvet Hand of Returning Air, Shadowless Claw, Wonder Gate Seal, Ling Snake Palm, Thunderstorm Strikes, Dashing Lightning, Chun Yuan Finger, Wind Splitting Claw, Hidden Gentle Palm, Wind Ripping Hand, Heavy Shadow Spear, Heavenly Demon Mouth, Thousand Splitting Fist, Devil Ape Transformation, Great Desolate Imprisoning Heavenly Finger, Saint Elephant Sky Crumbling Tackle, Lesser Nirvana Golden Body
QingYuan Art, Blood Transformation Art, Tri Sun Art, Great Sun Thunder Body
Secret Spirit Skills
Piercing Helicity, Materialized Spirit Needle, Qi Gathering Mental Vortex, Mental Corroding Skull, Ghastly Devil Howl
Wooden Pole Formation, Great Ancient Sword Formation, Four Divine Creatures Mega Formation, Mysterious Tempering Yuan Formation, Teleporting Formation, Triple Mysterious Black Formation, Nine Yin Mysterious Black Devil Formation, Nine Ghastly Demon Formation, Ghastly Puppet Devil Assembly Formation, Saint Light Formation, Nirvana Spirit Transformation Formation, Ancient Universe Formation, Nine Serene Guarding Spirit Formation
Stone Talisman, Black Steel Sword, Qian Kun Bag, Shattering Yuan Shrapnel, Autumn Scale Sword, Mysterious Ice Swords, Ever-Flame Sword, Nirvana Monument, Dragon Yuan Ring, Desolate Stone, Great Desolation Tablet, Static Tablet, Static Divine Tablet
Yuan Power, Yin Energy, Yang Energy, Nine Stars of Yuan Dan, Ling Qi, Yuan Power Seed, Mental Energy, Mental Energy Fire, Yuan Essence Energy, Nine Underworld Cold Qi, Nirvana Qi, Pill River, Desolate Force, Life Qi, Death Qi, Nirvana Golden Qi, Desolate Seed
Yuan Metal, Mysterious Ice Metal
Mystical Symbol, Ancient Swirl Symbol, Destiny Symbol, Destiny Soul Symbol, Destiny Heaven Symbol, Ancestral Symbol
Yuan Dan, Yin Dan, Yang Dan
Great Luo Golden Spear, Shattered Ice Sword, Glowing Flame Blade Disc, Ancient Heavenly Scales Halberd, Heavenly Jade Lotus, Moyun Blade, Broken Jade Sword, Green Yuan Spear, Heaven and Earth Hammers, Fire Cloud Spirit Armor, Spirit Accumulation Praying Mat, Mysterious Earth Armor, Spirit Wheel Mirror, Heavy Prison Peak, Blood Demonic Asura Spear, Saint Light Drum, Black Soul Treasure Vest, Soul Peak Sword, Black Dragon Sky Roaring Seal, Ghost Blade Seal, Heaven Sealing Array, Heavenly Phoenix Zither, Burning Sky Cauldron, Life Death Coffin Cover, Sky Net Divine Bed, Demon Shark Tooth, Sky Phoenix Space Shattering Bow, Disillusionary Holy Spirit Umbrella, Sky Splitting Ghost Halberd, Lightning Emperor Scepter, Immeasurable Mirror
Symbol Master, Symbol Ancestor, Super Sect
Terminus Devil Body, Naturally mesmerizing body
Symbol Puppet, Blood Soul Symbol Puppet, Bone Puppet, Pill Spirit Corpse
Demon Spirit, Yuan Spirit, Symbol Spirit
Lin Family Competition, Qingyang Town Hunt, Tower Battle, Ten-Year Clan Gathering of the Lin Clan, Battle of Seeds, Hundred Empire War, Great Sect Competition, Martial Gathering Of The 5 Clans, Lightning Competition
Celestial Dan Pool, Sacred Spirit Pool, Supreme Purity Celestial Pond
Demonic Crystal, Mind Millstone, NiWan Palace, Manifestation Symbol Array, Soul Symbol Vortex, Nirvana Heart, Soul Treasure, Twin Training Energy, Tempered Thunder Piece, Blood Essence, Thousand Beast Fruit, Charm Technique, Magic Scales Gold Heart, Bone Eroding Icy Wind, Manifestation Martial Tablet, Ancient Battlefield, Mysterious Ancient Key, Soul Demonic Dust, Nirvana Ranking, Nirvana Burning Sky Array, Nirvana Fire Thunder, Nirvana Demon Flame, Ring of Life and Death, Nirvana Fiery Thunder Bead, Nirvana Seal, Nirvana Golden Ranking, Heavenly Symbol Spirit Tree, Ancient Immortal Yuan Tree, Desolation Beads, Mountain challenge, Reincarnator, Mysterious Life Bone Bead, Demon Corpse, Spirit Emblem, Yimo, Silver Tower, Thunderbolt Core